We have shown the control of the magnetic gradients and modeled the gravitational gradients along the baseline. On one hand, magnetic field gradients are shielded below 2.5  and contribute to the bias acceleration at the sub . On the other hand, gravity gradients need to be modeled to account for inhomogeneities. We have shown that the non-linearities \(\delta g\)  in the model lead to a bias acceleration of 2.6 . With the achieved degree of control, performance of an absolute atom gravimeter would only be limited by the uncertainty of the gravity model[1]}. By transferring the gravity values measured by VLBAI at \(z_\mathrm {eff}\)  to neighboring positions, the Hannover VLBAI facility offers the perspective of providing a reference and calibration station for mobile devices. Furthermore, we envisage applications for testing fundamental physics, e.g. quantum clock interferometry [2]} and in searching for beyond-Riemann gravity [3]}.
